
1) Economic theory 2) Malthusian theory
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https://www.crosswordclues.com/clue/malthusianism

Malthusianism is a school of ideas derived from the political/economic thought of the Reverend Thomas Robert Malthus, as laid out in his 1798 writings, An Essay on the Principle of Population, which describes how unchecked population growth is exponential while the growth of the food supply was expected to be arithmetical. Malthus believed there w...
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http://en.wikipedia.org/wiki/Malthusianism

• (n.) The system of Malthusian doctrines relating to population.
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http://thinkexist.com/dictionary/meaning/malthusianism/

The idea, first advanced by Thomas Malthus two centuries ago, that population growth tends to outstrip the resources available to support it. Malthus argued that people must limit their frequency of sexual intercourse in order to avoid excessive population growth and a future of misery and starvation.
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http://www.encyclo.co.uk/local/20212
Mal·thu'sian·ism noun The system of Malthusian doctrines relating to population.
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http://www.encyclo.co.uk/webster/M/14

[
n] - Malthus` theory that population increase would outpace increases in the means of subsistence
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http://www.webdictionary.co.uk/definition.php?query=Malthusianism

neomalthusianism, malthusianism A doctrine which advocates birth control, abortion, and sterilization, together or separately, in order to curb population growth. Based on the theory that population increases faster than food supplies and is checked only by famine, disease, and war. Named for Thomas Robert Malthus, an English political economist, ...
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http://www.wordinfo.info/words/index/info/view_unit/1383/4
Malthusian theory noun Malthus` theory that population increase would outpace increases in the means of subsistence
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https://www.encyclo.co.uk/local/20974
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